Many many times, I see them all the time either on the street, or at work. I will say that I am not psychic, but a bit sensitive to the paranormal, and open minded.
At work, there was one time that I was sitting eating breakfast, there were only a couple people in the building and could account for them. But I looked up and saw a man standing besides me looking at me through a window which looks out to a lobby. There was no way that he could get there other then maybe the staircase which leads down to the lower common area of the building. Add to the fact the lights were out in the lobby, and the stairs as well were dark.
When I saw the man, he smiled and then he backed away and vanished.
Another time at work, I was down in this meeting room playing a piano. There was again just a few people up stairs, but no one there in the room. I hit the wrong note, (which happens often enough cause I play be ear, can't read a note to save my life.) I heard behind me, "C sharp" so I played it again, and this time played it with the C sharp note, and that was exactly the note I needed. then I heard, "good job." and a cold feeling rushed over me.
I have written about a ghost child named Jacob which lives here in our home, so yes, yes indeed I have seen spirits ghosts, and things that go bump in the night.